ABB 3HAC045128-003 Maintenance-Ready Spare for IRB6700 Automation
The ABB 3HAC045128-003 is an original servo motor with pinion designed for the IRB6700 robot series — one of ABB’s most widely deployed heavy-payload industrial robots in automotive, foundry, and general manufacturing environments. When this axis drive component fails or degrades, the result is immediate production stoppage. Sourcing a verified, original spare is the fastest path to restoring full robot operation and minimizing unplanned downtime costs.
This unit is supplied as a genuine ABB spare part, tested prior to shipment, and backed by a 12-month warranty. It is suitable for direct replacement in IRB6700-150/3.2, IRB6700-200/2.6, IRB6700-235/2.65, and related variants. Each unit is inspected for encoder integrity, pinion mesh condition, and motor winding resistance before dispatch.
For maintenance engineers managing robot fleets, the 3HAC045128-003 is a critical line item in any IRB6700 spare parts kit. Keeping one unit on the shelf eliminates the lead-time risk associated with emergency procurement and allows planned replacement during scheduled maintenance windows rather than reactive repair under production pressure.
Spare Maintenance Table
| Parameter | Specification |
|---|---|
| Part Number | 3HAC045128-003 |
| Brand | ABB |
| Product Type | Servo Motor with Pinion |
| Compatible Series | IRB6700 (all variants: 150/3.2, 200/2.6, 235/2.65) |
| Origin | Germany (OEM) |
| Axis Application | Robot axis drive (axis 1–3 depending on configuration) |
| Mounting Interface | Direct flange mount with integrated pinion gear |
| Encoder Type | Absolute multi-turn encoder (ABB standard) |
| Operating Voltage | Per ABB IRC5 controller specification |
| Protection Rating | IP67 (standard robot environment) |
| Operating Temperature | 0°C to +50°C ambient |
| Warranty | 12 months from date of shipment |
| Pre-shipment Test | Encoder check, winding resistance, pinion inspection |
| Condition | New / Original OEM |
| Lead Time | In stock — ships within 2 business days |
Maintenance Planning for Continuous Operation
Replacing the 3HAC045128-003 servo motor is rarely an isolated task. A thorough maintenance engineer will use this replacement event as an opportunity to audit the surrounding electrical and mechanical subsystems to prevent secondary failures and extend the robot’s service life.
Begin with the IRC5 controller cabinet: inspect the drive module (DSQC661 or DSQC662 axis computer) for fault history logs related to axis overcurrent or encoder loss. A degraded servo motor often stresses the drive module before the motor itself fails completely. Check the DSQC604 power supply unit for output voltage stability — an unstable 24VDC rail can cause intermittent encoder faults that mimic motor failure.
Inspect the motor cable harness (3HAC044168-001 or equivalent) for chafing, connector pin corrosion, and shield continuity. A damaged motor cable is a common root cause of premature servo motor failure and should be replaced proactively when the motor is changed. Similarly, verify the SMB (Serial Measurement Board, 3HAC031670-001) for battery backup integrity — a depleted SMB battery causes resolver position loss on power cycle, which can be misdiagnosed as a motor fault.
For the mechanical side, inspect the gearbox (3HAC040185-001 or axis-specific variant) for backlash, oil seal condition, and lubrication level. The pinion on the 3HAC045128-003 interfaces directly with the gearbox ring gear; any wear on the mating surface will accelerate pinion wear on the new motor. Check brake resistor modules in the IRC5 cabinet for signs of overheating — excessive regenerative braking loads indicate abnormal axis deceleration patterns that may have contributed to motor stress.
Also verify the FlexPendant (IRC5 teach pendant) and DSQC1000 main computer for any pending system alarms that were masked by the motor fault. Clearing the motor fault without addressing upstream controller issues will result in repeat failures. Finally, inspect I/O modules (DSQC652 digital I/O) and DeviceNet or PROFIBUS communication modules for fault indicators — a robot returning from a motor replacement should be fully re-commissioned with a motion test across all axes before returning to production.
Site Replacement Workflow
The 3HAC045128-003 is a direct OEM replacement for the original servo motor fitted to IRB6700 robots at the factory. No firmware modification or parameter re-mapping is required when replacing like-for-like within the same IRB6700 variant. The replacement procedure follows ABB’s standard axis motor exchange protocol:
Step 1 — Isolation: Place the robot in maintenance mode via the IRC5 FlexPendant. Engage the mechanical brake and confirm zero-energy state on all axes. Isolate the IRC5 cabinet from mains supply and verify with a voltage tester.
Step 2 — Motor removal: Disconnect the motor power cable and encoder cable at the robot arm connector. Remove the motor mounting bolts (torque specification per ABB service manual). Extract the motor assembly carefully to avoid pinion damage.
Step 3 — Installation: Install the 3HAC045128-003 into the motor housing. Torque mounting bolts to ABB specification. Reconnect power and encoder cables. Verify connector locking tabs are fully engaged.
Step 4 — Calibration: Perform axis calibration using ABB RobotStudio or the FlexPendant calibration routine. Update the revolution counter for the replaced axis. Verify calibration against the robot’s reference position marks.
Step 5 — Functional test: Run a slow-speed motion test across the full axis range. Monitor for vibration, abnormal current draw, or encoder fault codes. Return to production speed only after a clean test cycle.
This workflow minimizes downtime to a single maintenance shift when the spare is on-site and the maintenance team is prepared. Compared to waiting for emergency procurement, on-shelf availability of the 3HAC045128-003 can reduce unplanned downtime from days to hours.
Spare Parts Support FAQ
Q1: Is the 3HAC045128-003 compatible with all IRB6700 variants?
The 3HAC045128-003 is the standard servo motor with pinion for the IRB6700 series. Compatibility depends on the specific axis and robot variant (payload/reach configuration). Always cross-reference the robot’s serial number and axis assignment with ABB’s spare parts catalog or contact our technical team before ordering to confirm the correct part number for your specific unit.
Q2: What is included in the 12-month warranty?
All units are covered by a 12-month warranty from the date of shipment. The warranty covers manufacturing defects, encoder failure, and motor winding faults under normal operating conditions. It does not cover damage resulting from incorrect installation, overvoltage, or mechanical impact. Warranty claims are processed with return shipping support and priority replacement dispatch.
Q3: How is the unit tested before shipment?
Each 3HAC045128-003 unit undergoes pre-shipment inspection including encoder signal verification, motor winding resistance measurement, insulation resistance test, and visual inspection of the pinion gear and mounting flange. A test report is available upon request for quality-critical applications.
Q4: Can this part replace an older or discontinued ABB servo motor on the IRB6700?
In most cases, yes. ABB has maintained backward compatibility within the IRB6700 series for this motor assembly. However, if your robot was manufactured before 2014 or has been modified with non-standard axis configurations, please provide the robot serial number and current part number for verification. Our team can confirm interchangeability and advise on any required calibration adjustments.
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